You certainly have a browser hi-jacker.
1st thing to do is clear out all your temporary files, tool of choice is
ATF Cleaner , it is free and you do not have to install it. Download and instructions here:
ATF CLEANER
Download
MalwareBytes' AntiMalware aka MBAM, it too is free,
FROM HERE, click the green download button on the left of the page and save the file to your desktop.
* Double-click
mbam-setup.exe and follow the prompts to install the program.
* At the end, be sure a checkmark is placed next to the following:
o Update Malwarebytes' Anti-Malware
o Launch Malwarebytes' Anti-Malware
* Then click
Finish .
· If an update is found, it will download and install the latest version.
* Once the program has loaded, select
Perform Full scan , then click Scan.
* When the scan is complete, click
OK , then
Show Results to view the results.
* Be sure that everything is checked, and click
Remove Selected .
* When completed, a log will open in Notepad. Reboot as required.
dave